Unfortunately the most environmentally conscious things you can do are boring and a bit of a fun sponge.
Stop buying new stuff unless it’s essential. Repair clothes where possible before replacing them. Wash them less often and at 30°.
Take holidays by rail or car rather than fly.
Don’t buy cute little beeswax wraps and microfibre cloths, use an upturned plate over things in bowls in the microwave or fridge and use old towels or those multi packs of cotton facecloths IKEA do for every paper towel or microfibre cloth job.
Batch cooking is more energy efficient. If you get takeaways, the clear plastic tubs curry comes in will usually last at least 5 or six re-uses in the freezer and microwave for batch cooked meals so don’t throw them out.
Don’t buy bottled water, if you must buy a soft drink when out buy a can not a plastic bottle and recycle it, switch to a glass bottles milk delivery if you have one locally, reduce meat consumption by 20%.
Time showers, turn the hot water temperature down a few degrees, put on a jumper before considering turning on heating.
Don’t buy Stuff. Most stuff is unnecessary. Use your library (or little free libraries if you have them near you), swap things via local Facebook groups, borrow or hire anything not needed often.
If something can be grown in season in the U.K. consider mostly only buying it then, and restrict buying asparagus from Peru in December (as an example). You’ll value and enjoy the seasonal stuff all the more.
Leave a section of your garden uncultivated, however small. It’s very valuable for wildlife.
Use mooncups or washable sanpro if you can. If not, at least make sure any tampons have cardboard rather than plastic applicators.
Thete are a lot more, but that’s a start.